Testing lamp for heavy current installations



Dec. 11, 1928.

J. F. SCHLEPER TESTING'LAMP FOR HEAVY CURRENT INSTALLATIONS Filed Sept. 10, 1923 Invehzar Patented Dec. 11, 1928.

PATENT OFFICE.

JOHANNES FRANCISCUS SCI-ILEPER, OF AMSTERDAM, NETHERLANDS.

TESTING LAMP FOR HEAVY CURRENT INSTALLATIONS.

Application filed September 10, 1923, Serial No. 661,851, and in the Netherlands September 12, 1922.

The invention relates to the special construction of a testing lamp for heavy current installations. Vith the use of the hitherto known lamps serving these purposes it had 6 always to be feared and it also frequently happened that in case of a too strong electric energy the lamp was destroyed, whereby the person carrying the lamp had to suffer more or less severe injuries.

The object of the present invention is to entirely remove these disadvantages and to produce a testing lamp which in case of its manipulation makes it impossible that the carrier becomes injured. With this object in view the plug of the lamp line has been fitted with safety fuses which in case of an excessive electric stress immediately cut off the current supply. A further feature of the invention consists in a. perforated protecting cap placed over the lamp which provides against a breaking of the bulb and against the circumvolation of glass splinters.

Upon the accompanying drawing one mode of carrying out the invention is shown by way of example.

In this modification a denotes the lamp proper, b the protecting cap enclosing the bulb. The line 0 is fitted on its ends with plugs d. On these plugs is screwed a casing in which the safety fuse e is embedded, while they are also fitted with contact pins f actuated by springs g.

It goes without saying that the construction of the various parts of the device can be modified without thereby departing from the nature of the invention.

I claim as my invention:

In an electrical testing lamp, a separable two part plug of insulating material containing a safety fuse, a movable pin having a plate at the inner end, and a conducting spring between the fuse and plate whereby the pin is urged outwardly.

In testimony whereof I have signed my name to this specification.

JOHANNES FRANCISCUS SCHLEPER. 

